Blake Lively and Leonardo DiCaprio have been on Hollywood’s romance radar since they first hooked up in May and it looks like it’s getting more and more serious!

Leonardo DiCaprio, 36, is notorious for only dating supermodels. So when he hooked up with Gossip Girl actress, 24-year-old Blake Lively, more than a few eyebrows were raised with speculation that their whirlwind romance was just another Tinseltown publicity stunt. Well, turns out they’re the real deal and Leo isn’t just spending time with Blake, he’s all about bonding with her dad too!

Although Leo missed celebrating Blake’s 24th birthday due to his Great Gatsby filming schedule in Australia, he was in Los Angeles Aug. 14 at celebrity hotspot, Madeo, to surprise Blake’s father, Ernie, with an extravagant coloring book for his birthday. An insider told Us Weekly, “Blake’s father loved it.”

It’s been reported that Leo loves spending time with Blake’s family, which is very out of character for the normally reserved and private actor. Just one more sign that the two lovebirds could be heading down the aisle in the not-so-distant future!

“[They] are so smitten it’s crazy,” another source spilled. “I bet they get engaged in the next six months!”